JP2015189480A - Package and heat-shrinkable film used for it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package and heat-shrinkable film used for the package, in which a separating piece between a pair of weakening lines on a covering heat-shrinkable film is hardly broken during separation.SOLUTION: There is provided a package in which a covered object comprising a first part having a short peripheral length and a second part having a long peripheral length is covered with a cylindrical heat-shrinkable film 20. A pair of weakening lines 22 having a gap in circumferential direction is formed on the heat-shrinkable film 20. A separating piece 23 between the pair of weakening lines 22 is constructed so as to be able to be separated from the other parts. Peripheral length of the first part is defined as L1. Peripheral length of the second part is defined as L2. Width between the pair of weakening lines 22 on the first part is defined as W1. Width between the pair of weakening lines 22 on the second part is defined as W2. When L1/L2 is RL and W1/W2 is RW, there is a relationship of RL<RW.

Description

  The present invention relates to a package on which a heat-shrinkable film is mounted, and a heat-shrinkable film used for the package.

  A heat-shrinkable film to be mounted on various packages such as containers is generally formed into a cylindrical shape, fitted on the package, and heat-shrinked by being heated by a shrink tunnel or the like. It will be in close contact with the object to be packaged by heat shrinkage. In this heat-shrinkable film, weak lines such as a pair of perforations may be formed for opening or removing from a packaged object. That is, a pair of weakening lines are formed along the axial direction of the tubular heat-shrinkable film, a band-shaped portion between the pair of weakening lines is a separation piece, and the separation piece is another piece along the weakening line. It is set as the structure which separates and removes from a part.

  However, in the case where the circumference of the article to be packaged is not constant but greatly changed, the separation piece may break during the separation operation, and the separation piece may be separated to the end. There was a problem that it was impossible.

Utility Model Registration No. 3149757

  Therefore, the present invention has been made in view of the above-mentioned conventional problems, and is used for a package body in which a separation piece between a pair of weakening lines in the attached heat-shrinkable film is not easily broken during the separation, and the package body. It is an object of the present invention to provide a heat shrinkable film.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the circumference of the packaged object has greatly changed, such as the diameter of the packaged object to be mounted has changed greatly. In other words, it was found that the width (separation distance) between the pair of weakening lines formed on the heat-shrinkable film before shrinkage is a factor.

  FIG. 12 shows a conventional heat-shrinkable film 120 before shrinkage. In FIG. 12, the vertical direction is the axial direction. Since the cylindrical heat-shrinkable film 120 is in a flat folded state, when the surface shown in FIG. 12 is the front, the back side is the same shape as the front side, and the weakening line 122 is the same on the back side. Is formed. The pair of weakening lines 122 are formed in a straight line in the axial direction, and the distance between the two weakening lines 122 is constant. Therefore, the width of the separation piece 123 between the pair of weakening lines 122 is also constant. FIG. 13 shows a state where the heat-shrinkable film 120 is attached to the container body of the container 101 which is a PET bottle (PET bottle). The body 143 of the container main body is thick and has a constant diameter, but the shoulder 142 located on the upper side thereof has a smaller diameter than the body 143 and gradually decreases in diameter toward the upper side. ing. The heat-shrinkable film 120 is attached so as to cover substantially the entire body 143 and shoulder 142 of the container body.

  The shrinkage amount of the heat-shrinkable film 120 is larger at the shoulder portion 142 than at the body portion 143, and the shrinkage amount is gradually increased toward the upper side at the shoulder portion 142. Therefore, the width of the pair of weakening lines 122 in the heat-shrinkable film 120 after shrinkage is relatively wide at the trunk portion 143, relatively narrow at the shoulder portion 142, and further toward the upper side at the shoulder portion 142. It gradually becomes narrower. Then, when the separation piece 123 between the pair of weakening lines 122 is separated from other portions from the upper end of the heat-shrinkable film 120 toward the lower side, as shown in FIG. There were cases in which cracks 150 entered from the weakening line 122 toward the inside of the separation piece 123, the left and right cracks 150 gradually approached, and the separation piece 123 eventually broke during the separation. . The position where the cut piece 123 finally breaks varies, but the portion where the crack 150 is likely to enter is such that the shrinkage amount of the heat-shrinkable film 120 is large and the width between the pair of weakening lines 122 is larger than that of the body portion 143. The shoulder 142 was narrowed.

  Also in Patent Document 1, a pair of weakening lines (main body peeling sewing line 4) is formed along the axial direction on the heat-shrinkable film in a state before shrinkage, but the width between the pair of weakening lines is patented. As shown in FIG. 4 of Document 1, it is constant in a state before contraction. On the other hand, the diameter of the container main body to be packaged is not constant, and is small at the shoulder near the mouth. When the heat-shrinkable film is attached to the container, as shown in FIG. The width between the pair of weak lines in the vertical direction is narrower at the shoulder than at the trunk. Therefore, in order to remove the heat-shrinkable film from the container, when the separation piece between the pair of weak lines in the vertical direction is separated along the pair of weak lines from top to bottom, the gap between the pair of weak lines is There is a problem that the separation piece is easily cracked at the shoulder portion of the container having a narrow width, and the separation piece breaks in the middle of the separation, so that the separation piece cannot be separated to the end.

  The present invention has been completed by obtaining such knowledge, and the package according to the present invention has a cylindrical shape in a packaged object having a first part with a short circumference and a second part with a long circumference. The heat-shrinkable film is provided with a pair of weakening lines that are spaced apart in the circumferential direction, and the separation pieces between the pair of weakening lines are separated from other parts. It is configured to be separable, the circumference of the first part is L1, the circumference of the second part is L2, the width between the pair of weakening lines in the first part is W1, and the width between the pair of weakening lines in the second part Is W2, L1 / L2 is RL, and W1 / W2 is RW, the relationship is RL <RW.

  By forming a pair of weakening lines, the entire circumference of the tubular heat-shrinkable film is divided into two areas of large and small, and the longer and shorter of the entire circumference are short between the weakening lines. However, in the present invention, it means the shorter one.

  In addition, the circumferential length refers to a length that circulates around the center line in the up-down direction (axial direction) of the article to be packaged. When the side peripheral surface is composed of a plurality of surfaces arranged in the lateral direction as in the case where the article to be packaged is a polygon or the like, the length is one round of the side peripheral surface, When the object to be packaged is a cylindrical container, the length is the circumference of the outer peripheral surface.

  Furthermore, for the first part with a short circumference and the second part with a long circumference, for example, in the range of the package to be covered with the heat-shrinkable film, there are three parts P1, P2, P3 having different circumferences. If there is a relationship of PL1, <PL2, <PL3, where the circumferences are PL1, PL2, and PL3, respectively, P2 which is basically the longest circumference is the second part. Thus, P1 and P2 having a shorter circumference are the first part. Therefore, the relationship RL <RW may be satisfied between P1 and P3, and the relationship RL <RW may be satisfied between P2 and P3. Further, P2 may be the second part, P1 may be the first part, and the relationship of RL <RW may be satisfied between P1 and P2.

  A specific example will be described. When the heat-shrinkable film 20 is attached to a polygonal container body as shown in FIG. 1, the abdomen 7 having the longest circumference in the container body is the second part, and the enlarged part 6 (shoulder) having a shorter circumference than that. Part) as the first part, the abdomen 7 and the enlarged part 6 can be configured to have the relationship RL <RW. In particular, the circumference at the upper end with the shortest circumference in the enlarged portion 6 is L1, the circumference at the abdomen 7 is L2, and the width between the pair of weakening lines at the upper end of the enlarged portion 6 is W1, The width between the pair of weakening lines can be configured to have the relationship of RL <RW, where W2.

  When the heat-shrinkable film 20 is attached to the PET bottle as the container 1 so as to cover from the lower end of the container body to the peripheral edge of the top surface of the cap 44 as shown in FIG. The portion 42 may be the first part, and the body 43 of the container body may be the second part so that the relationship RL <RW is satisfied. The cap 44 may be the first part.

  The same applies to the case where the heat-shrinkable film 20 does not cover up to the cap 44 but covers the region up to the upper portion of the shoulder 42 as shown in FIG. The second part 43 can be configured to have the relationship of RL <RW. In particular, the portion of the shoulder 42 where the upper end 20a of the heat-shrinkable film 20 is located can be the first part.

  Furthermore, as shown in FIG. 7, when the shoulder 42 is a substantially horizontal surface bent inward at an angle of approximately 90 degrees with respect to the trunk 43, or the shoulder 42 has a slight upward slope of the trunk 43. In the case of reaching from the upper end to the lower end of the mouth part 41 and covering the periphery of the shoulder part 42 so that the upper part of the heat-shrinkable film 20 wraps around the shoulder part 42, it is substantially horizontal or slightly upward. A portion where the upper end 20a of the heat-shrinkable film 20 is located in the shoulder portion 42 of the gradient may be a first portion, and the body portion 43 may be a second portion.

  Further, as shown in FIG. 8, the cap 51 and the body portion 50 of the container body have substantially the same diameter, and the entire body portion 50 of the container body is covered with the heat shrinkable film 20 from the cap 51 and the heat shrinkable film 20 is covered. In the configuration in which the upper portion wraps around the top surface 52 of the cap 51 and covers the peripheral portion of the top surface 52, the cap 51 and the body portion 50 of the container main body are used as the second portion, and among the peripheral portions of the top surface 52 of the cap 51. A portion where the upper end 20a of the heat-shrinkable film 20 is located may be the first part.

  Further, as shown in FIG. 9, the body portion of the container body is not substantially constant in diameter, but has a central constricted portion 45, an upper belly portion 46 positioned above the constricted portion 45, and a lower side of the constricted portion 45. In the case of having the lower abdominal part 47 located at the position, the constricted part 45 can be a first part, and the upper abdominal part 46 and the lower abdominal part 47 can be a second part. Further, the shoulder part 42 can be a first part, and the upper stomach part 46 and the lower stomach part 47 can be a second part, and in particular, a part of the shoulder part 42 where the upper end 20a of the heat-shrinkable film 20 is located. It can be the first part.

  By the way, such a heat-shrinkable film is a so-called shrink film, and has a cylindrical shape in a state where it is attached to an article to be packaged. Therefore, the circumferential direction of the article to be packaged is the circumferential direction of the cylindrical heat-shrinkable film. In addition, it is common that the heat-shrinkable film is already formed in a cylindrical shape before being attached to the package, but in a state before being attached to the package, it is still flat. In addition, it may be formed into a cylindrical shape by being wound around the package object when mounted on the package object. As the heat-shrinkable film, a uniaxially stretched film that contracts mainly in the circumferential direction can be used, but a biaxially stretched film that contracts also in the axial direction may be used. The uniaxially stretched film refers to a film that is substantially uniaxially stretched, and means a film that has significantly different shrinkage rates in the circumferential direction (so-called TD direction) and the axial direction (so-called MD direction). It does not mean only a film that does not shrink at all (so-called shrinkage rate is zero). Specifically, for example, a film having a thermal contraction rate of 20 to 80% in the circumferential direction and a thermal contraction rate of −5 to 10% in the axial direction at 90 ° C. for 10 seconds (warm water treatment) can be mentioned. For example, in the case of a uniaxially stretched film that contracts mainly in the circumferential direction, the circumferential direction is the main stretching direction.

  In general, both sides of a long heat-shrinkable film having the short direction as the TD direction so that the short direction is the circumferential direction are bonded to each other to form a long cylindrical shape. It cut | disconnects for every and forms a cylindrical heat-shrinkable film. The cylindrical heat-shrinkable film is placed on the object to be packaged, and the heat-shrinkable film is heat-shrinked by a shrink tunnel or the like to adhere to the object to be packaged. On the other hand, a long, heat-shrinkable film whose longitudinal direction is the TD direction so that the longitudinal direction of the film becomes the circumferential direction when it is wound is cut into a rectangular flat sheet A leaf-shaped heat-shrinkable film is formed, the flat heat-shrinkable film is wound around the packaged object so that the TD direction is the circumferential direction, and both ends are bonded to form a cylinder, and then heat-shrink It can also be set as the so-called winding type heat-shrinkable film which is made to adhere to a to-be-packaged object.

  And the to-be-packaged object which is the mounting | wearing object of a heat-shrinkable film is not a thing with constant circumference, but has the 1st part with short circumference, and the 2nd part with long circumference. Corresponding to the shape of such an article to be packaged, the width between the pair of weakening lines and the width of the separating piece are adjusted and set in a state before heat shrinkage. Specifically, the width of the separation piece is not the same width in the part attached to the first part and the part attached to the second part, but in the part attached to the first part. Is set wider than that of the portion to be attached to the second part. If the width of the cut piece is constant before heat shrinkage, the cut piece in the first part corresponds to the ratio of the circumference of the first part and the circumference of the second part after heat shrinkage. Is smaller than the width of the separation piece in the second part, that is, RL = RW. For this reason, when the separation piece is separated, cracks tend to occur from the weak line to the inner separation piece in the first part, and the separation piece breaks in the middle of the separation. The piece cannot be separated. On the other hand, in the present invention, since it has a relationship of RL <RW, it is difficult to cause a crack in the separation piece in the first part during the separation, and the breakage of the separation piece is suppressed. The separation piece can be separated from other parts until the end.

  In particular, when the package includes a polyhedral portion and the heat-shrinkable film is attached to the package so as to cover at least the polyhedral portion, the pair of weakening lines is It is preferable to be located in one plane in the polyhedral shape portion of the package or in a plurality of planes aligned in the axial direction of the heat shrink film. When the polyhedron shape has only one surface along the axial direction of the heat-shrinkable film at the location of the separating piece, a pair of weakening lines will be located in that one surface, and the polyhedron shape When the cut piece has a plurality of surfaces along the axial direction of the heat-shrinkable film, a pair of weakening lines are located in the plurality of surfaces arranged in the axial direction. In any case, the pair of weakening lines are separated from the weakening lines by being located in one plane in the polyhedral shape portion of the package or in a plurality of planes aligned in the axial direction of the heat shrink film. As a result, cracks hardly occur toward the inside of the piece, and the cut piece is hard to break. As a result, even if it is a polyhedral shape, the cut piece can be reliably cut to the end. In addition, that a pair of weakening line is located in a surface includes that the weakening line is located on the side edge of the surface.

  Moreover, the heat-shrinkable film according to the present invention is a heat-shrinkable film used for the packaging body, and includes a pair of weakening lines that are spaced apart in the circumferential direction of the package, and between the pair of weakening lines. The part to be attached to the first part rather than the width between the pair of weakening lines in the part to be attached to the second part in a state before heat shrinkage is configured to be separable from other parts. The width between the pair of weakening lines is wider.

  The article to be packaged is not a constant peripheral length, but has a first part with a short peripheral length and a second part with a long peripheral length. Corresponding to the shape of such a package, the width between the pair of weakening lines and the width of the separating piece are adjusted and set. Specifically, the width of the separation piece is not the same width in the part attached to the first part and the part attached to the second part, but in the part attached to the first part. Is set wider than that of the portion to be attached to the second part. If the width of the cut piece is constant before heat shrinkage, the cut piece in the first part corresponds to the ratio of the circumference of the first part and the circumference of the second part after heat shrinkage. Is narrower than the width of the separating piece in the second part. For this reason, when the separation piece is separated, cracks tend to occur from the weak line to the inner separation piece in the first part, and the separation piece breaks in the middle of the separation. The piece cannot be separated. On the other hand, in the present invention, in the state before heat shrinkage, the width of the separating piece in the portion attached to the first part is set wider than that in the part attached to the second part. Therefore, the width of the separating piece in the first part becomes relatively wider after the heat shrinking compared to the case where the width of the separating piece is made constant before the heat shrinking. In other words, in the state of being attached to the package, the difference between the width of the separation piece in the first part and the width of the separation piece in the second part is smaller than the conventional one, or in the first part The width of the cut piece and the width of the cut piece in the second part are substantially the same, or the width of the cut piece in the first part is slightly smaller than the width of the cut piece in the second part. Become wider. Therefore, it becomes difficult for cracks to be generated in the first piece in the middle of the separation, and the breakage of the separation piece is suppressed, so that the separation piece can be separated from the other parts to the end.

  In particular, it is preferable that the portion attached to the first part is located on the upstream side in the separation direction, and the part attached to the second part is located on the downstream side in the separation direction. When the separation piece is separated along a pair of weakening lines after heat shrinkage, the width of the separation piece on the downstream side in the separation direction is wider than the width of the separation piece on the upstream side in the separation direction. Then, the separation piece is easy to break during the separation. This is because at the time of separation, cracks tend to enter from the weak line toward the inside rather than the outside of the separation piece. Therefore, it is preferable that the portion to be mounted on the first part is positioned on the upstream side in the separation direction so that the width of the separation piece on the upstream side in the separation direction becomes as wide as possible. In general, when the weakening line formed on the heat-shrinkable film is cut off, the purpose of removing the heat-shrinkable film can be achieved if the cutting is brought to the second part beyond the first part. It is.

  Furthermore, the article to be packaged is a container having a container body and a cap that is detachably attached to the mouth of the container body, and the container body has a mouth and a body part below the mouth part. Is provided between the abdomen and an enlarged part that is located between the mouth and abdomen and gradually increases in circumference toward the abdomen, and the heat-shrinkable film is at least from the lower part of the cap to the container body. The range up to the abdomen can be covered, and in the state before heat shrinkage, the width between the pair of weakening lines in the part attached to the enlarged part is larger than the width between the pair of weakening lines in the part attached to the abdomen. It is preferable that the width is wider. When a heat-shrinkable film is attached to such a container with a cap, the separation piece is separated from the top to the bottom. Cracks tend to occur toward the piece. Therefore, in the state before heat shrinking, by making the width between the pair of weakening lines in the portion attached to the enlarged portion wider than the width between the pair of weakening lines in the portion attached to the abdomen The occurrence of cracks in the enlarged portion can be effectively suppressed.

  As described above, in the present invention, the occurrence of cracks in the first part is conventionally increased by setting the width of the separating piece in the first part of the packaged object having a relatively large shrinkage amount in advance. Therefore, the separation piece is not easily broken in the middle of the separation, and the separation piece is easily separated along a pair of weak lines until the end.

The package to which the heat-shrinkable film in one Embodiment of this invention is mounted | worn is shown, (a) is a front view, (b) is a side view. The front view which shows the heat-shrinkable film in the same embodiment. The side view which shows the to-be packaged object (packaging body) with which the heat-shrinkable film was mounted | worn. The front view which shows the heat-shrinkable film in other embodiment of this invention. The perspective view which shows the to-be packaged object (packaging body) with which the heat-shrinkable film was mounted | worn. The perspective view which shows the to-be packaged object (packaging body) with which the heat-shrinkable film in other embodiment of this invention was mounted | worn. The perspective view which shows the to-be packaged object (packaging body) with which the heat-shrinkable film in other embodiment of this invention was mounted | worn. The perspective view which shows the to-be packaged object (packaging body) with which the heat-shrinkable film in other embodiment of this invention was mounted | worn. The perspective view which shows the to-be packaged object (packaging body) with which the heat-shrinkable film in other embodiment of this invention was mounted | worn. (A) And (b) is a front view which shows the heat-shrinkable film in other embodiment of this invention. (A) And (b) is a front view which shows the heat-shrinkable film in other embodiment of this invention. The front view which shows the conventional heat-shrinkable film. The perspective view which shows the to-be packaged object with which the heat-shrinkable film was mounted | worn. The perspective view which shows the state in the middle of separating the separation piece of a heat-shrinkable film from the said package.

  Hereinafter, a heat-shrinkable film according to an embodiment of the present invention and a package in which the heat-shrinkable film is mounted on a package will be described with reference to FIGS. The packaged object to be mounted may be various articles and is not limited to a container. In the present embodiment, a container with a cap will be described as an example. As shown in FIG. 1, a container 1 as an object to be packaged is a container 1 whose circumferential length that circulates around a center line T in the vertical direction is not constant but greatly changes.

  The container 1 includes a container main body and a cap 3. The container main body is configured to be able to accommodate contents, and an opening is formed at the upper end thereof. The cap 3 closes the opening of the container main body. The container main body includes a body portion formed to accommodate the contents, and a mouth portion protruding from the upper portion of the body portion. The trunk is composed of three parts. That is, the trunk part is an enlarged part 6 whose circumferential length gradually increases from the top toward the lower side, and an abdominal part whose circumferential length is substantially constant and whose circumferential length is the maximum in the container body. 7 and a reduction portion 8 whose circumferential length gradually decreases toward the lower side. As described above, the trunk portion has a shape in which the circumferential length gradually increases from the upper end toward the center in the vertical direction, and the circumferential length gradually decreases from there toward the lower end. In this embodiment, when the enlarged part 6 and the abdomen 7 are compared, the circumference of the enlarged part 6 is relatively short and the circumference of the abdomen 7 is relatively long. Accordingly, the enlarged portion 6 is a first part with a short circumference, and the abdomen 7 is a second part with a long circumference. In particular, the upper end, which is the shortest part of the enlarged portion 6, is the first part. can do.

  In addition, the body portion is a polyhedron shape, specifically having an octagonal outline in front view and back view, and flattened back and forth when the front and back are front and back. The dimension in the front-rear direction is smaller than the dimension in the left-right direction. As shown in FIG. 1B, the front-rear dimension of the body portion is substantially constant along the vertical direction in a side view, whereas the body portion is viewed in a front view and a back view as shown in FIG. Since the dimension in the left-right direction is not constant along the vertical direction, the circumference of the body portion is not constant along the vertical direction.

  More specifically, the body portion has a pair of front and rear main surfaces 10 that form an octagon that forms the front surface or the back surface, and an upper side surface 11, a central side surface 12, and a lower side surface 13 that form left and right side surfaces. Both the front and rear main surfaces 10 are wider than the side surfaces and have a maximum area in the body portion. The left and right upper side surfaces 11, the central side surface 12 and the lower side surface 13 constitute six sides in total in the left and right sides of the octagonal outline of the trunk in front view and rear view, and the upper side surface 11 The center side surface 12 is inclined to the outside so as to gradually move away from the center line T, the central side surface 12 is formed in the vertical direction without being inclined, and the lower side surface 13 gradually approaches the center line T toward the lower side. So that it is tilted inward. As described above, the left and right side surfaces of the body portion are composed of three surfaces arranged in the vertical direction, ie, the upper side surface 11, the central side surface 12 and the lower side surface 13. In addition, the lower surface of the trunk portion constitutes the bottom surface of the container body.

  A mouth part projects upward from the center of the upper surface of the body part. The mouth portion is a portion to which the cap 3 is screwed and is generally cylindrical, and has a large-diameter base portion 17 projecting from the upper surface of the body portion, and projecting above the base portion 17. A screw portion 18 having a smaller diameter than the base portion 17 is provided. The cap 3 is detachably screwed to the screw portion 18 of the mouth portion. The cap 3 has a cylindrical shape or a rounded round cylindrical shape and has an outer diameter substantially equal to the outer diameter of the base portion 17 of the mouth portion. Yes. The base portion 17 and the cap 3 at the mouth are thinner than the trunk portion. Therefore, the circumferential length of the base portion 17 of the mouth and the circumferential length of the cap 3 are shorter than the circumferential length of the trunk portion. The portion having the shortest circumference in the enlarged portion 6 of the trunk portion is the upper end of the enlarged portion 6, but the circumference of the base portion 17 of the mouth portion or the circumference of the cap 3 rather than the circumference at the upper end of the enlarged portion 6. Is even shorter.

  Next, the non-shrinkable heat-shrinkable film 20 attached to such a container 1 will be described. The heat-shrinkable film 20 has a cylindrical shape as shown in FIG. 2 and is folded in a flat shape. The vertical direction of the container 1 is the axial direction of the heat-shrinkable film 20 (arrow A in FIG. 2), and the circumferential direction of the container 1 is the circumferential direction of the heat-shrinkable film 20 (arrow B in FIG. 2). Since the heat-shrinkable film 20 is in a state of being flatly folded, when the surface shown in FIG. 2 is the front, the back side has the same shape as the front side. Further, the side edges 21 are folds along the axial direction, and when expanded from a flat state, the both side edges 21 have a symmetrical shape with the crease as the center. The heat-shrinkable film 20 is configured to cover from the lower part of the cap 3 of the container 1 to the lower end of the body part, and the total length in the axial direction from the upper end 20a to the lower end is from the lower part of the cap 3 of the container 1. It is slightly longer than the length to the lower end of the trunk. In addition, it is preferable that the heat-shrinkable film 20 goes around to the lower surface peripheral part of a trunk | drum. Further, the entire cap 3 may be covered.

  The heat-shrinkable film 20 is formed with a pair of opening weakening lines 22 separated by a predetermined distance in the circumferential direction. That is, a weakening line 22 is formed over the entire length from the upper end to the lower end at the same position in the front and rear at a position separated from the one side edge 21 of the heat shrinkable film 20 by a predetermined distance. The front and rear weakening lines 22 are a pair of opening weakening lines 22, and a band-like portion between the two weakening lines 22 is an opening separating piece 23. In the present embodiment, the weakening line 22 is a perforation, but may be in a form other than the perforation. After the heat-shrinkable film 20 is mounted on the container 1, when the strip-like separation piece 23 is separated and removed from the other part of the heat-shrinkable film 20 along the pair of weakening lines 22, the tubular heat-shrinkability is obtained. The film 20 is divided at one place in the circumferential direction to form a C shape in plan view, and the heat-shrinkable film 20 can be easily removed from the container 1. The method of forming the weakening line 22 is arbitrary. A method of forming one or a plurality of blocks on which the blades for forming the weakening lines are arranged and pressing the blocks against the heat-shrinkable film 20, or forming a weakening line. Various methods may be used, such as a method of heating the block on which the blade is formed to form the hole of the weakening line 22, a method of forming by irradiating laser light, a method of using a die roll, and the like.

  Since one side edge 21 constituting the fold is located in the middle between the pair of weakening lines 22, the distance from the one side edge 21 to the weakening line 22 is the distance between the pair of weakening lines 22. ½ of the width of the strip-shaped separating piece 23. Here, the weakening line 22 is not formed in a straight line over the entire length in parallel with the one side edge 21 but is composed of two upper and lower portions having different shapes. Specifically, the weakening line 22 is composed of an upper first portion and a lower second portion, and the first portion gradually moves from one side edge to the other side. 21 is a linear inclined straight portion 24 inclined so as to approach 21, and the second portion extends below the first portion and is straight (parallel to the axial direction) with one side edge 21. It is the parallel straight part 25 extended in the shape. Accordingly, the width of the separation piece 23 gradually decreases toward the lower side in the inclined straight line portion 24 and is constant in the parallel straight line portion 25.

  When the heat-shrinkable film 20 is attached to the container 1, the inclined straight part 24 is located in a part that covers from the lower part of the cap 3 to the enlarged part 6 of the body part of the container body, and the parallel straight part 25 is a part of the body part. It is located in the part covering from the abdomen 7 to the reduced part 8. Therefore, the lower end of the inclined straight portion 24 is the upper end of the parallel straight portion 25 and is also a bending point formed on the weakening line 22, but the position thereof is the lower end of the enlarged portion 6 of the trunk portion of the container body at the time of mounting ( The upper end of the abdomen 7). The width of the separating piece 23 in the inclined straight portion 24 (the width between the pair of weakening lines 22) is wider than that in the parallel straight portion 25. The reason is that in the state where the container 1 is mounted, This is because at least the width of the separating piece 23 is made substantially equal in the enlarged portion 6 and the abdominal portion 7. As described above, the circumferential length of the container 1 is maximum at the abdomen 7 of the container body, and the enlarged part 6 is shorter than the abdomen 7 and gradually increases toward the abdomen 7. Therefore, the shrinkage amount of the heat-shrinkable film 20 is the smallest in the abdomen 7 of the container body, and the enlarged part 6 is larger than the abdomen 7 and gradually increases upward. In order to respond to such changes in the shape and circumference of the container 1, the width of the separating piece 23 in the inclined linear portion 24 is set so as to gradually narrow toward the lower side. Specifically, the width of the separation piece 23 in the inclined linear portion 24 is gradually reduced downward, but the absolute value of the change rate is the absolute value of the change rate of the circumference in the enlarged portion 6. Almost equal. As shown in FIG. 2, a cut line 26 may be provided on the upper end portion of the weakening line 22 on the separation start side on the order of several millimeters. However, the cut line 26 may be omitted.

  Further, since the separation piece 23 is separated from the upper side to the lower side at the time of opening, it is preferable to project the opening tab 27 upwardly on the upper end 20a of the heat-shrinkable film 20. . The knob 27 is formed between the pair of weakening lines 22 and constitutes the upper end of the separating piece 23. In addition, since this heat-shrinkable film 20 is formed by cutting a long tubular film folded flat into a predetermined length, when the knob 27 is formed, the heat-shrinkable film 20 is heat-shrinkable. A cutout 28 corresponding to the shape of the knob 27 is formed at the lower end of the conductive film 20. The shape and size of the knob 27 are arbitrary. For example, the knob 27 can have a trapezoidal shape gradually narrowing toward the upper side as shown in FIG. Moreover, it is preferable that the weakening line 22 is located at the root portion of the knob piece 27, that is, the width at the root portion of the knob piece 27 and the width between the pair of weakening lines 22 at the upper end may be made substantially equal. preferable.

  Specific examples of the resin film constituting the heat-shrinkable film 20 include polyolefins such as linear low density polyethylene (LLDPE), low density polyethylene (LDPE), high density polyethylene (HDPE), and polypropylene (PP), polyethylene Polyesters such as terephthalate (PET) and polybutylene terephthalate (PBT), polystyrene (PS), polylactic acid (PLA), polyamide, ethylene vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer (EAA), the film which consists of vinyl-type resin, such as polyvinyl chloride, is mentioned. Moreover, the film containing the resin mixture which mixed 2 or more types of these resin can also be used, and the laminated | multilayer film which laminated | stacked 2 or more types of films can also be used. Of these, polyester-based, polyolefin-based, and polystyrene-based films are preferable, and polyester-based films are particularly preferable because they have appropriate shrinkage stress and high transparency. Further, as described above, a uniaxially stretched film that contracts mainly in the circumferential direction is preferable.

  The thickness of the heat-shrinkable film 20 is not particularly limited, but is preferably 8 to 100 μm, more preferably 10 to 80 μm, and particularly preferably 15 to 60 μm. It is also preferable to use a colored resin cylindrical film or a resin film on which a printing layer for displaying a trade name, a design, or the like is formed. That is, a so-called shrink label may be used.

  When a weakening line 22 is provided in a direction substantially parallel to the MD direction of the heat-shrinkable film 20, and is heat-shrinked by covering the container 1, and then cut along the weakening line 22, the average tear strength in the MD direction Even if is too large or conversely too small, the tendency to break in the middle of separation becomes remarkable. However, by adopting the configuration of the present embodiment, the range of the appropriate average tear strength in the MD direction of the heat shrinkable film 20 that can prevent breakage during the separation is widened. The average tear strength in the MD direction is preferably 20 to 80 N / mm, and more preferably 27 to 66 N / mm. Here, the average tear strength is measured according to JIS K7128 A method.

  When the heat-shrinkable film 20 having the above-described configuration is expanded and covered with the container 1, and placed in a shrink tunnel or the like and heated to be in close contact with the container 1, the result is as shown in FIG. In a state where the heat-shrinkable film 20 is mounted on the container 1, the width between the pair of weakening lines 22, that is, the width of the separation piece 23 is substantially constant from the lower part of the cap 3 to the enlarged part 6 and the abdomen 7 of the container body. Yes, the shrinking portion 8 of the container body becomes gradually narrower toward the lower side. The reason why the width of the separating piece 23 is substantially constant from the lower part of the cap 3 to the abdomen 7 of the container main body is that the inclined straight part 24 is provided on the weakening line 22 in the heat-shrinkable film 20 in an unshrinked state. . In addition, the width of the separating piece 23 gradually narrows downward in the reduced portion 8 of the container body because the parallel straight line portion 25 of the weak line 22 in the heat-shrinkable film 20 in an unshrinked state is formed to the lower end. It is because it has been. If the lower part of the parallel straight line portion 25 is inclined in such a manner as to gradually move away from the one side edge 21 toward the lower side instead of being parallel to the one side edge 21 in the uncontracted state, that is, If the width of the separating piece 23 at the lower part of the portion 25 is gradually widened downward, the width of the separating piece 23 is substantially constant even in the reduced portion 8 of the container body in the mounted state on the container 1. It becomes.

  The pair of weakening lines 22 are located on the upper side surface 11, the central side surface 12, and the lower side surface 13, which are the side surfaces of the body portion, and are not located on the main surface 10. At least a pair of the weakening lines 22 are located in the side surface so as not to protrude to the main surface 10 side, and are positioned at a boundary portion between the main surface 10 and the upper side surface 11, the central side surface 12, and the lower side surface 13. Or it is located inside the side of the boundary part. Accordingly, the width of the separation piece 23 is the same as or narrower than the width of the side surface of the body portion.

  In the packaging body formed by mounting the heat-shrinkable film 20 on the container 1 as described above, the separation piece 23 is separated along the pair of weakening lines 22 from the upper side to the lower side. Can be opened. At that time, since the knob piece 27 is formed at the upper end of the separating piece 23, the knob piece 27 can be picked and the separation can be easily started. Further, since the cut line 26 is provided at the upper end of the weakening line 22, the start of separation becomes smooth. And since the width | variety of the separation piece 23 is substantially constant from the lower part of the cap 3 to the abdominal part 7 of a container main body, it is hard to fracture | rupture the separation piece 23 in the middle of a separation operation | work, and can be separated to the last. When the cut piece 23 is cut downward, the crack is likely to enter from the weakening line 22 toward the inner cut piece 23 in the enlarged portion 6 where the circumference gradually increases. Since the width of the separating piece 23 is substantially constant in the enlarged portion 6, it is difficult for cracks to occur, and the separating piece 23 can reach the abdomen 7 without breaking during the separation. And if the cut piece 23 can be cut and advanced to the abdomen 7 without cracking inside the cut piece 23, then the cut piece 23 can be easily cut to the lower end of the abdomen 7, Further, the separation piece 23 can be easily separated in the reduced portion 8 as well.

  If the width between the pair of weakening lines 22 is constant in the non-shrinked state as in the prior art, and the heat-shrinkable film 20 is attached to the container 1 having the above-described configuration, the separating piece 23 in the enlarged portion 6 is used. Is gradually widened toward the abdomen 7 located on the lower side. On the other hand, in the present embodiment, in the uncontracted state, there is provided an inclined linear portion 24 in which the width between the pair of weakening lines 22 is not constant but gradually increases toward the upper side. Since 24 covers the enlarged portion 6 of the container 1, the width of the separation piece 23 in the enlarged portion 6 becomes substantially equal to that in the abdominal portion 7 in a state where the enlarged portion 6 is attached to the container 1. The width of the separating piece 23 is substantially constant over the abdomen 7.

  For example, the circumferential length at the upper end of the enlarged portion 6 of the container 1 is L1, the circumferential length at the abdomen 7 of the container 1 is L2, and L1 / L2 is RL. In a state where 20 is contracted, the width between the pair of weakening lines 22 at the upper end of the enlarged portion 6 of the container 1 is W1, the width between the pair of weakening lines 22 in the abdomen 7 of the container 1 is W2, and W1 / W2 is RW. When the width between the pair of weakening lines 22 is constant in the uncontracted state as in the prior art, the contraction rate is the same as that of the container 1, so that W1 <W2 and RL = RW. On the other hand, in this embodiment, since the inclined straight line portion 24 is provided on the weakening line 22 in the uncontracted state, W1≈W2 and W1 / W2≈1 after contraction, so that RL <RW. A relationship will be established. However, W1≈W2 is not necessarily required. If at least the relationship of RL <RW is satisfied, the occurrence of cracks in the enlarged portion 6 is suppressed as compared with the conventional case. Preferably, RW is 1.3 times or more and 2 times or less of RL, that is, RL × 1.3 ≦ RW ≦ RL × 2, more preferably RW is 1.5 times or more and 1.8 times or less of RL. That is, RL × 1.5 ≦ RW ≦ RL × 1.8. W1 / W2 is preferably 0.8 or more and 1.5 or less, more preferably 0.9 or more and 1.3 or less, and further preferably 0.95 or more. 1.1 or less. Depending on the contraction conditions, an excessive amount of heat may be applied in the vicinity of the weakening line 22, so that W1 and W2 at the time of design and those after actual contraction may not necessarily be the same.

  In the reduction part 8, the width of the separation piece 23 is gradually narrowed toward the lower side. However, since the separation direction of the separation piece 23 is from the upper side to the lower side, also in the reduction part 8. The separating piece 23 can be smoothly separated without breaking. That is, if the width of the separation piece 23 is gradually enlarged along the separation direction, a crack is likely to occur from the weakening line 22 to the inside of the separation piece 23 at that portion. If the width of the separation piece 23 is gradually reduced along the separation direction, cracks are unlikely to occur in the portion, and therefore the separation piece 23 is smoothly separated without breaking in the reduction portion 8. Can continue.

  Moreover, although the trunk | drum of a container main body is a polyhedron shape, since the separation piece 23 is located so that it may be settled in the side surface of a trunk | drum, and does not protrude to the main surface 10 side, it cuts in the middle of separation. The separation piece 23 becomes more difficult to break. Therefore, in FIG. 3, the separating piece 23 is located at the center in the left-right direction of the side surface of the body portion, but may be eccentric to the left and right so that it does not protrude from the main surface 10.

  In addition, the container 1 used as object may be various, may be a cylindrical thing, for example, may be a PET bottle. For example, as shown in FIG. 4, the heat-shrinkable film 20 is formed with a pair of weakening lines 22 composed of an inclined straight line portion 24 and a parallel straight line portion 25, and the heat-shrinkable film 20 is a PET bottle as shown in FIG. It is good also as what is called a full shrink structure which covers from the bottom part of the container main body of the container 1 to the top | upper surface of the cap 44. FIG. Also in this case, as in the case of the above-described embodiment, the container 1 includes a container body and a cap 44, and the container body includes a mouth portion 41, a shoulder portion 42 that is an enlarged portion, and a trunk portion 43. . The shoulder portion 42 is a region from the lower end of the mouth portion 41 to the upper end of the trunk portion 43, and is a portion whose diameter gradually increases toward the lower side, and its circumferential length gradually decreases toward the lower side. It gets longer. The trunk portion 43 has a substantially constant diameter and a substantially constant circumferential length. In this case, the shoulder part 42 becomes the first part and the trunk part 43 becomes the second part.

  And the parallel straight line part 25 is located in the part which covers the trunk | drum 43 of a container main body, and the inclination straight line part 24 is located in the part which covers the whole part located above the trunk | drum 43 of a container main body. That is, the inclined straight portion 24 is located at a portion covering from the cap 44 to the shoulder portion 42 of the container body. The upper portion of the heat-shrinkable film 20 wraps around the top surface of the cap 44 and covers the periphery of the top surface, and the upper end 20 a of the heat-shrinkable film 20 is located on the top surface of the cap 44. The shoulder portion 42 is a portion where cracks are easily generated from the weakening line 22 toward the inside of the separation piece 23, but the width between the pair of weakening lines 22 is substantially constant in the mounted state on the container 1. Therefore, when the cut piece 23 is cut downward and opened, the shoulder portion 42 is prevented from cracking from the weakening line 22 toward the inside of the cut piece 23, and the heat shrinkable film. The separation piece 23 can be surely separated to the lower end of 20. In addition, as shown in FIG. 4, you may comprise without the knob 27, and the presence or absence of the knob 27 is arbitrary.

  Moreover, the structure which covers the area | region to the upper part of the shoulder part 42, without covering the heat shrinkable film 20 to the cap 44 like FIG. Also in this case, the shoulder part 42 of the container body is the first part and the trunk part 43 is the second part. In particular, the part of the shoulder part 42 where the upper end 20a of the heat-shrinkable film 20 is located is the first part. It can be.

  Furthermore, as shown in FIG. 7, the shoulder 42 is a substantially horizontal surface bent inward at an angle of about 90 degrees with respect to the body 43, or from the upper end of the body 43 with a slight upward slope. The structure which reaches the lower end of 41 may be sufficient. The upper part of the heat-shrinkable film 20 is wrapped around the shoulder part 42 so as to cover the peripheral part of the shoulder part 42. The part of the heat-shrinkable film 20 that covers the peripheral part of the shoulder part 42 is a highly shrinkable part. is there. Accordingly, the portion of the shoulder portion 42 where the upper end 20a of the heat-shrinkable film 20 is located is the first portion, the body portion 43 is the second portion, and the width of the separation piece 23 after the heat shrinkage is from the body portion 43 to the shoulder. You may make it become constant over the part 42. FIG.

  Further, as shown in FIG. 8, the cap 51 and the body portion 50 of the container main body may have substantially the same diameter, and the container 1 may be covered with the heat-shrinkable film 20. The upper portion of the heat-shrinkable film 20 wraps around the top surface 52 of the cap 51 and covers the peripheral portion of the top surface 52. In this case also, the portion of the heat-shrinkable film 20 that covers the peripheral portion of the top surface 52 of the cap 51 Is the part of high shrinkage. Accordingly, the cap 51 and the body portion 50 of the container body are the second part, and the portion where the upper end 20a of the heat-shrinkable film 20 is located in the peripheral part of the top surface 52 of the cap 51 is the first part. The width of the separation piece 23 may be constant from the trunk portion 50 to the top surface 52 of the cap 51.

  Moreover, the trunk | drum of a container main body may not be substantially constant in diameter like FIG. 9, but a bowl shape may be sufficient. Specifically, when the body portion of the container body has a central constricted portion 45, an upper belly portion 46 located above the constricted portion 45, and a lower belly portion 47 located below the constricted portion 45, The constricted part 45 may be the first part, and the upper stomach part 46 and the lower stomach part 47 may be the second part. Since the constricted part 45 has a small diameter and a short circumference like the shoulder part 42, the heat-shrinkable film 20 is highly shrunk at that part. Therefore, after contraction, if the width of the separation piece 23 in the upper stomach part 46 or the lower stomach part 47 and the width of the separation piece 23 in the constricted part 45 are made the same, the occurrence of cracks in the constricted part 45 is prevented. It is possible to suppress breakage of the separating piece 23. In addition, it is good also considering the shoulder part 42 as 1st part and the upper stomach part 46 as 2nd part. In particular, the portion of the shoulder 42 where the upper end 20a of the heat-shrinkable film 20 is located can be the first part. And it is more preferable to make the width | variety of the separation piece 23 constant from the upper end 20a of the heat-shrinkable film 20 to a lower end.

  Further, the shape of the weakening line 22 can be variously changed and may be arbitrarily changed corresponding to the shape of the packaged object such as the container 1, but representative examples are shown below. For example, as shown in FIG. 10A, the weakening line 22 may be curved as a whole. The shape of the curve is arbitrary, but as a whole, for example, the width between the pair of weakening lines 22 gradually decreases from the upper end to the center and gradually increases from the center toward the lower end. It can be made into the circular arc shape which makes the inner side of the cut piece 23 convex. Moreover, you may form so that the width | variety between a pair of weak line 22 may become narrow gradually toward the bottom as a whole like FIG.10 (b). That is, the whole weak line 22 may be an inclined straight part inclined with respect to one side edge 21. Furthermore, the weakening line 22 may be composed of three parts. For example, as shown in FIG. 11A, the width between the pair of weakening lines 22 gradually decreases from the top toward the bottom. An inclined straight line portion 30, a parallel straight line portion 31 having a constant width between the pair of weakening lines 22, and an inclined straight line portion 32 in which the width between the pair of weakening lines 22 gradually widens downward. It may be configured. Of course, the weakening line 22 may be composed of four or more parts. Furthermore, the weakening line 22 may be composed of a combination of a curved portion and a straight portion, and may be composed of, for example, an upper curved portion and a lower straight portion as shown in FIG. Specifically, an arcuate curved portion that protrudes outside the separating piece 23 so that the width between the pair of weakening lines 22 gradually widens from the upper end toward the lower side and then gradually decreases. 33 may be provided on the upper side, and the parallel linear part 34 may be provided on the lower side. Further, the curved line portion 33 may be combined with an inclined straight line portion instead of the parallel straight line portion 34.

  EXAMPLES Next, although this invention is demonstrated concretely based on an Example, this invention is not limited to these at all.

<Example 1>
The next container 1 and the heat-shrinkable film 20 shown in FIG. 1 were used. After the heat-shrinkable film 20 was attached to the container 1 under the following conditions, an opening test was performed.
[Container 1]
Overall height including cap 3: 57.0 mm
Height of container body only (enlarged part 6, abdominal part 7 and reduced part 8): 36.0 mm
Height to the upper end of the abdomen 7 in the container body: 25.0 mm
Peripheral length (L1) of the upper end of the enlarged portion 6 (first part) in the container body: 58.7 mm
Peripheral length (L2) of the abdomen 7 (second part) in the container body: 100.9 mm
RL = L1 / L2 = 0.6
[Heat shrinkable film 20]
Material: Polyester (Toyobo Co., Ltd. “SC820”, thickness 40 μm)
Total length in the axial direction: 45.0mm
Circumference length: 104.0mm
Length from the lower end to the upper end of the parallel linear portion 25: 25.0 mm
Width of the portion covering the upper end of the enlarged portion 6 (first part) of the inclined straight portion 24 in the separating piece 23: 13.5 mm
Width of the parallel straight line portion 25 at the separating piece 23 (between the pair of weakening lines 22): 8.0 mm
[Installation conditions]
Specifically, it is fitted on the container 1 so that the upper end 20a of the heat-shrinkable film 20 is located under the cap 3. Thereafter, when the entire heat-shrinkable film 20 is heated to a predetermined temperature (for example, 80 ° C. to 100 ° C.), the heat-shrinkable film 20 shrinks in the circumferential direction and adheres to the outer surface of the container 1. At this time, the heat shrinkage is performed with steam, hot air or the like, but is not particularly limited.
[result]
As a result, the width (W1) of the separation piece 23 at the upper end of the enlarged portion 6 (first part) is 8.1 mm, and the width (W2) of the separation piece 23 at the abdomen 7 (second part) is 7.8 mm. RW = W1 / W2 = 1.0. Since RL = L1 / L2 = 0.6, the relationship is RL <RW. And when the picking piece 27 was picked and the cut piece 23 was cut downward, it was possible to cut the cut piece 23 to the end without breaking the cut piece 23 in the middle of cutting. .

<Comparative Example 1>
The heat-shrinkable film is applied to the container 1 in the same manner as in the example 1 except that the parallel straight part 25 is provided up to the upper end 20a of the heat-shrinkable film 20 instead of the inclined straight part 24 of the heat-shrinkable film 20 of the first example. After mounting 20, an opening test was performed. As a result, W1 = 4.6 mm, W2 = 7.9 mm, and RW = W1 / W2 = 0.6. Since RL = 0.6 as described above, the relationship is RL = RW. When the opening test was performed, a crack occurred from the weakening line 22 toward the inside of the separation piece 23, and the separation piece 23 broke in the middle of the separation, and could not be completely separated to the lower end. In particular, a crack occurred in the enlarged portion 6 of the trunk, and as a result, the cut piece 23 broke along the way.

DESCRIPTION OF SYMBOLS 1 Container 3 Cap 6 Expansion part 7 Abdominal part 8 Reduction part 10 Main surface 11 Upper side surface 12 Central side surface 13 Lower side surface 17 Base part 18 Screw part 20 Heat-shrinkable film 20a Upper end 21 Side edge 22 Weak line 23 Cutting piece 24 Inclination straight line Part 25 parallel straight part 26 cut line 27 knob 28 notch 30 inclined straight part 31 parallel straight part 32 inclined straight part 33 curved part 34 parallel straight part 41 mouth part 42 shoulder part 43 trunk part 44 cap 45 constricted part 46 Abdominal part 47 Lower stomach part 50 Body part 51 Cap 52 Top surface 101 Container 120 Heat-shrinkable film 122 Weak line 123 Cut piece 142 Shoulder part 143 Body part 144 Cap 150 Crack T Center line

Claims (5)

A package in which a cylindrical heat-shrinkable film is attached to an article to be packaged having a first part with a short circumference and a second part with a long circumference,
The heat-shrinkable film is formed with a pair of weakening lines spaced in the circumferential direction, and a separation piece between the pair of weakening lines is configured to be separable from other parts,
L1 / L2 where L1 is the circumference of the first part, L2 is the circumference of the second part, W1 is the width between the pair of weakening lines in the first part, and W2 is the width between the pair of weakening lines in the second part. A packaging body characterized by having a relationship of RL <RW where RL is RL and W1 / W2 is RW. The package includes a polyhedral part, and a heat-shrinkable film is attached to the package so as to cover at least the polyhedral part.
The package according to claim 1, wherein the pair of weakening lines are located in one plane of the polyhedral part of the package or in a plurality of planes aligned in the axial direction of the heat shrink film. A heat-shrinkable film used for the package according to claim 1,
A pair of weakening lines spaced apart in the circumferential direction of the package are provided, and a separation piece between the pair of weakening lines is configured to be separable from other parts,
In the state before heat shrinkage, the width between the pair of weakening lines in the portion attached to the first part is wider than the width between the pair of weakening lines in the portion attached to the second part. Heat shrinkable film.   The heat-shrinkable film according to claim 3, wherein the portion attached to the first part is located on the upstream side in the separating direction, and the part attached to the second part is located on the downstream side in the separating direction. An article to be packaged is a container provided with a container main body and a cap detachably attached to the mouth of the container main body, the container main body is provided with a mouth and a lower trunk, and the trunk is An abdomen, and an enlarged part that is located between the mouth and abdomen and gradually increases in circumference toward the abdomen,
The heat-shrinkable film can cover at least the range from the lower part of the cap to the abdomen of the container body,
The heat shrinkage according to claim 4, wherein, before the heat shrinkage, the width between the pair of weakening lines at the portion attached to the enlarged portion is wider than the width between the pair of weakening lines at the portion attached to the abdomen. Sex film.

Images